package com.lex.common.utils;


import jakarta.servlet.http.HttpServletRequest;

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * 获取IP方法
 * 
 *
 */
public class IpUtil {
    private static final String UNKNOWN = "unknown";
    private static final String LOCALHOST = "127.0.0.1";
    private static final String SEPARATOR = ",";

    public static String getIpAddr(HttpServletRequest request) {
        System.out.println(request);
        String ipAddress;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || UNKNOWN.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || UNKNOWN.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || UNKNOWN.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (LOCALHOST.equals(ipAddress)) {
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            // "***.***.***.***".length()
            if (ipAddress != null && ipAddress.length() > 15) {
                if (ipAddress.indexOf(SEPARATOR) > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
            if ("0:0:0:0:0:0:0:1".equals(ipAddress)){
                ipAddress = "127.0.0.1";
            }
        } catch (Exception e) {
            ipAddress = "";
        }
        return ipAddress;
    }
    public static boolean isInternalIP(String ipAddress) {
        try {
            byte[] ip = InetAddress.getByName(ipAddress).getAddress();
            // 10.x.x.x
            if (ip[0] == 10) {
                return true;
            }
            // 172.16.x.x 到 172.31.x.x
            else if (ip[0] == 172 && ip[1] >= 16 && ip[1] <= 31) {
                return true;
            }
            // 192.168.x.x
            else if (ip[0] == 192 && ip[1] == 168) {
                return true;
            }
            // 不是私有IP
            return false;
        } catch (Exception e) {
            // 如果地址格式不正确，返回false
            return false;
        }
    }
}